[CI] Increase the sanitizer builds timeout

Summary:
ASAN and UBSAN recently timed out
(https://build.bitcoinabc.org/viewLog.html?buildId=73787&guest=1 and
https://build.bitcoinabc.org/viewLog.html?buildId=73751&guest=1)

Test Plan: Run the CI builds

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D7680